Synthesis and Biological Studies of a New Series of 5-Heteroarylcarbamoylaminopyrazolo[4,3-e]1,2,4-triazolo[1,5-c]pyrimidines as Human A3 Adenosine Receptor Antagonists. Influence of the Heteroaryl Substituent on Binding Affinity and Molecular Modeling Investigations
摘要:
Some pyrazolotriazolopyrimidines bearing different heteroarylcarbamoylamino moieties at the N5-position are described. We previously reported the synthesis of a water soluble compound with high potency and selectivity versus the human A(3) adenosine receptor as antagonist, and herein we present an enlarged series of compounds related to the previously mentioned one. These compounds showed A(3) adenosine receptor affinity in the nanomolar range and different levels of selectivity evaluated in radioligand binding assays at human A(1), A(2)A, A(2B), and A(3) adenosine receptors. In particular, the effect of the heteroaryl substituents at the N5 position has been analyzed. This study allows us to recognize that the presence of a pyridinium moiety in this position not only increases water solubility but also improves or retains potency and selectivity at the human A(3) adenosine receptors. In contrast, replacement of pyridine with different heterocycles produces loss of affinity and selectivity at the human A(3) adenosine receptors. A molecular modeling study has been carried out with the aim to explain these various binding profiles.
Visible Light-Induced Regioselective Cycloaddition of Benzoyl Azides and Alkenes To Yield Oxazolines
作者:Peter Bellotti、Julien Brocus、Fatima El Orf、Mohamed Selkti、Burkhard König、Philippe Belmont、Etienne Brachet
DOI:10.1021/acs.joc.9b00568
日期:2019.5.17
regioselective synthesis of oxazolines in high yields. The mild photosensitized manifold leverages the intermolecular formation of oxazolines with a wide functional group tolerance on both benzoyl azides and alkenes partners. Mechanistic investigations suggest the sensitization of the azide moiety as the key activation step.
Reaction of Amide and Sodium Azide for the Synthesis of Acyl Azide, Urea, and Iminophosphorane
作者:Devaneyan Joseph、Sunwoo Lee
DOI:10.1021/acs.orglett.2c02429
日期:2022.8.26
in DMF at 25 °C and produce the symmetrical ureas in THF/H2O at 80 °C via the sequential reaction of acyl substitution and Curtius rearrangement. All acyl azides were also obtained from the secondary amides via sequential reaction of p-toluenesulfonyl chloride and NaN3. In addition, keto-stabilized iminophosphoranes were prepared from a one-pot reaction of amides, NaN3, and phosphines.
酰胺与 NaN 3在 25 °C 下在 DMF 中反应生成酰基叠氮化物,并在 80 °C 下通过酰基取代和 Curtius 重排的顺序反应在 THF/H 2 O 中生成对称脲。所有的酰基叠氮化物也是由仲酰胺通过对甲苯磺酰氯和NaN 3 的顺序反应得到的。此外,由酰胺、NaN 3和膦的一锅法反应制备了酮基稳定的亚氨基正膦。
Orientation in the Furan Nucleus. VIII. β-Acylaminofurans
作者:Robert R. Burtner
DOI:10.1021/ja01318a037
日期:1934.3
Kuhn; Krueger, Chemische Berichte, 1956, vol. 89, p. 1473,1483
作者:Kuhn、Krueger
DOI:——
日期:——
BRIDSON J. N., CAN. J. CHEM., 1979, 57, NO 3, 314-317